Onigiri (ume) Recipe

Rinse and soak rice

Place 2 cups short-grain Japanese rice in a fine-mesh sieve. Rinse under cold running water, stirring gently with your hand, until the water runs nearly clear (about 3–5 rinses). Drain and transfer to a rice cooker or a medium pot. Add 2.2 cups water. Let the rice soak 30 minutes at room temperature (shorter if rice was rinsed cold and you need faster prep).

Cook rice

If using a rice cooker, cook according to the machine's white-rice setting. If using a pot, bring rice and water to a gentle boil over medium-high heat, then reduce heat to low, cover tightly, and simmer 12–14 minutes without lifting the lid. Remove from heat and let rest, covered, 10 minutes to finish steaming.

Season rice

While rice rests, mix 1 tablespoon rice vinegar, 1/2 teaspoon granulated sugar, and 1/4 teaspoon fine sea salt in a small bowl until dissolved. Transfer hot rice to a large wooden or plastic bowl (avoid metal). Gently fold the vinegar mixture into the rice with a rice paddle or spatula using cutting and folding motions to avoid smashing the grains. Fan or let rice cool to warm (not hot) — about 5–10 minutes — so it's easy to handle for shaping.

Prepare ume filling

If using whole umeboshi, remove pits and finely chop the flesh. Combine chopped umeboshi with 1 teaspoon ume paste if using and 1 teaspoon toasted sesame seeds (optional) in a small bowl. Taste — umeboshi can be very salty/tart; adjust by adding a tiny pinch of sugar or more paste if you prefer a smoother, milder filling. The filling should be moist but not watery.

Prep hands and nori

Have a small bowl of water ready to wet your hands and another small pinch bowl with 1/4 teaspoon coarse salt to season the rice lightly while shaping. Cut nori sheets into 3x4-inch strips (or desired size).

Shape onigiri (makes 6 medium onigiri)

Wet your hands lightly with water (dip and shake off excess). Sprinkle a tiny pinch of coarse salt on your palm to season the rice. Pick up about 1/3 cup (loosely packed) warm rice and flatten it into your hand to form a small disk. Place about 1 teaspoon of ume filling in the center. Fold rice over filling and cup with both hands to shape into a triangle or oval by pressing gently and rotating: press the rice between your palms, forming two flat sides and a point for a triangle, or simply shape into a compact oval. Avoid over-compressing; onigiri should hold together but remain fluffy. Repeat with remaining rice and filling to make about 6 onigiri.

Wrap with nori

Wrap each onigiri with a strip of nori: place the nori strip around the base or halfway up the triangle so the seaweed covers one side and provides a clean edge for holding. If you prefer crispy nori, wrap just before serving. For softer nori (adhering to rice), wrap immediately.

Serve and store

Serve onigiri warm or at room temperature. If storing, place onigiri in an airtight container lined with plastic wrap; keep in refrigerator up to 24 hours (nori will soften). To eat later without soggy nori, store nori separately and wrap just before serving. Reheat gently (microwave 10–20 seconds) if desired, but avoid overheating which makes rice hard.